From 1a1919d40c79728e653a701b5a73e9e463da33aa Mon Sep 17 00:00:00 2001
From: Trekkie Coder <trekkie@netlox.io>
Date: Mon, 4 Mar 2024 15:37:43 +0900
Subject: [PATCH] gh-481 Support for selection of LB end-points based on
 least-connections

---
 common/common.go        | 2 ++
 loxilb-ebpf             | 2 +-
 loxinet/dpbroker.go     | 1 +
 loxinet/dpebpf_linux.go | 2 ++
 loxinet/rules.go        | 2 ++
 5 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/common/common.go b/common/common.go
index de669f6a7..687fcf9a6 100644
--- a/common/common.go
+++ b/common/common.go
@@ -471,6 +471,8 @@ const (
 	LbSelPrio
 	// LbSelRrPersist - persist connectons from same client
 	LbSelRrPersist
+	// LbSelLeastConnections - select client based on least connections
+	LbSelLeastConnections
 )
 
 // LBMode - Variable to define LB mode
diff --git a/loxilb-ebpf b/loxilb-ebpf
index b79d22ecd..8eeb767fc 160000
--- a/loxilb-ebpf
+++ b/loxilb-ebpf
@@ -1 +1 @@
-Subproject commit b79d22ecd52e2a0fd77f6dfb298cd3f166f4d41b
+Subproject commit 8eeb767fcf206f480f829ee7b4d7b462ab3f801d
diff --git a/loxinet/dpbroker.go b/loxinet/dpbroker.go
index 7383e917f..32e60703b 100644
--- a/loxinet/dpbroker.go
+++ b/loxinet/dpbroker.go
@@ -261,6 +261,7 @@ const (
 	EpHash
 	EpPrio
 	EpRRPersist
+	EpLeastConn
 )
 
 // NatEP - a nat end-point
diff --git a/loxinet/dpebpf_linux.go b/loxinet/dpebpf_linux.go
index 9382641b4..3c01ef677 100644
--- a/loxinet/dpebpf_linux.go
+++ b/loxinet/dpebpf_linux.go
@@ -942,6 +942,8 @@ func DpNatLbRuleMod(w *NatDpWorkQ) int {
 			dat.sel_type = C.NAT_LB_SEL_HASH
 		case w.EpSel == EpRRPersist:
 			dat.sel_type = C.NAT_LB_SEL_RR_PERSIST
+		case w.EpSel == EpLeastConn:
+			dat.sel_type = C.NAT_LB_SEL_LC
 		/* Currently not implemented in DP */
 		/*case w.EpSel == EP_PRIO:
 		  dat.sel_type = C.NAT_LB_SEL_PRIO*/
diff --git a/loxinet/rules.go b/loxinet/rules.go
index a9cc0ea25..d88345fbe 100644
--- a/loxinet/rules.go
+++ b/loxinet/rules.go
@@ -2306,6 +2306,8 @@ func (r *ruleEnt) Nat2DP(work DpWorkT) int {
 			nWork.EpSel = EpRR
 		case at.sel == cmn.LbSelRrPersist:
 			nWork.EpSel = EpRRPersist
+		case at.sel == cmn.LbSelLeastConnections:
+			nWork.EpSel = EpLeastConn
 		default:
 			nWork.EpSel = EpRR
 		}